They went from falling in love to falling out of it. What remained was a mess of broken hearts, longing, remorse and sadness. She took it harder than him. Then came hate, anger, bitterness. She worked really hard at the "getting over" bit, and eventually got there. He was less devastated, he saw it coming. Then came indifference. All of this culminated into casual and polite concern, and nothing more. From love to plain civility, the range of emotions successfully traversed half-way around the earth as they lived their respective lives on the opposite sides of the globe. By way of polite enquiry, they find out that they might end up meeting again, to live in that same city they once met in. Pure coincidence? The romantic in her wants to ascribe more to it.
The cynic in her is going to make sure it never happens.